The 5D Mark III is better than the Mark II, no doubt about that. That being said, I still have some reservations because of the big price difference between the two. I'm not convinced it's necessarily worth the ~$1500 more than the 5D Mark II, unless you are getting paid for your photography, or if you need the advantages/features it provides.

There is no harm in holding one in your hand at your local shop and playing with it there.

Are you using the new DPP to process the 5D3 images? I'm curious to know how well the DLO ("digital lens optimizer") works.